(not the syringe and not the "a band or belt that one would use to make their veins more visible")
Calling heroin the "dinosaur" came from an earlier slang used for Heroin "Tar". It's a common belief that dinosaurs became fosil fuel or "tar-like" over millions of years... The La Brea tar pits (in Los Angeles, CA) is an example.
The other slang contributing to the use of the "Dinosaur" meaning heroin is the saying "monkey on your back" referring to any addiction controlling you.
In the song Pool Shark by sublime Brad sings "tying on the Dinosaur tonight. ...use to be so cool."
Here he is referring to how his recreational heroin habit had grown into a full blown uncontrollable addiction. Describing his "monkey" as a "dinosaur" he had on his back can be interpreted many ways.
Brad was acknowledging the enormity of his problem, his increasing consumption, his inability to control it and also acknowledging the fact that all heroin addicts face extinction every time they get high... extinct ...like a dinosaur.
The "tying on" or "tying off" is slang for the process of finding a vein to shoot up or more so ...the complete ritual of shooting up any drug to get high... but I digress.
Lyrics from "Pool Shark" by Sublime
"I like lying naked in my bedroom
Tying on that dinosaur tonight
It used to be so cool...
But, now I got that needle and I can shake
but I can't breathe.
You take it away but, I want more and more
One day I'm gonna lose the war."
-Brad Nowells (1968–1996)
Often our society shows a disinterest with the phenomena of the dinosauria, approaching paleontology with a "they're dead, who cares" attitude. They are also ridiculed for having "died out" when they in fact persisted a period of something like 160 million years--more than 40 times longer than the time elapsed since the earliest human anscestors appeared. Even the word "dinosaur" has a deprecative connotation, implying something that is outdated or obsolete.
Stop for a moment to consider that these animals did, in fact exist, and are not the chimeras of children. This writer would maintain, however, that anyone holding the view that an interest in dinosaurs is nerdy and childish deserves to have his or head bitten off by a Charcharodontosaurus.
Dinosaur 2: "Oh no!"
thinkin how things weren't so cool to me
My baby likes to shoot pool
I like lying naked in my bedroom
Tying on the dinosaur
tonight it used to be so cool